src/mesa/drivers/dri/i965/gen6_gs_state.c

   1 /*
   2  * Copyright © 2009 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #include "brw_context.h"
  29 #include "brw_state.h"
  30 #include "brw_defines.h"
  31 #include "intel_batchbuffer.h"
  32
  33 static void
  34 gen6_upload_gs_push_constants(struct brw_context *brw)
  35 {
  36    struct brw_stage_state *stage_state = &brw->gs.base;
  37
  38    /* BRW_NEW_GEOMETRY_PROGRAM */
  39    const struct brw_geometry_program *gp =
  40       (struct brw_geometry_program *) brw->geometry_program;
  41
  42    if (gp) {
  43       /* BRW_NEW_GS_PROG_DATA */
  44       struct brw_stage_prog_data *prog_data = &brw->gs.prog_data->base.base;
  45
  46       gen6_upload_push_constants(brw, &gp->program.Base, prog_data,
  47                                  stage_state, AUB_TRACE_VS_CONSTANTS);
  48    }
  49
  50    if (brw->gen >= 7)
  51       gen7_upload_constant_state(brw, stage_state, gp, _3DSTATE_CONSTANT_GS);
  52 }
  53
  54 const struct brw_tracked_state gen6_gs_push_constants = {
  55    .dirty = {
  56       .mesa  = _NEW_PROGRAM_CONSTANTS |
  57                _NEW_TRANSFORM,
  58       .brw   = BRW_NEW_BATCH |
  59                BRW_NEW_GEOMETRY_PROGRAM |
  60                BRW_NEW_GS_PROG_DATA |
  61                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
  62    },
  63    .emit = gen6_upload_gs_push_constants,
  64 };
  65
  66 static void
  67 upload_gs_state_for_tf(struct brw_context *brw)
  68 {
  69    BEGIN_BATCH(7);
  70    OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
  71    OUT_BATCH(brw->ff_gs.prog_offset);
  72    OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE);
  73    OUT_BATCH(0); /* no scratch space */
  74    OUT_BATCH((2 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
  75              (brw->ff_gs.prog_data->urb_read_length << GEN6_GS_URB_READ_LENGTH_SHIFT));
  76    OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
  77              GEN6_GS_STATISTICS_ENABLE |
  78              GEN6_GS_SO_STATISTICS_ENABLE |
  79              GEN6_GS_RENDERING_ENABLE);
  80    OUT_BATCH(GEN6_GS_SVBI_PAYLOAD_ENABLE |
  81              GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
  82              (brw->ff_gs.prog_data->svbi_postincrement_value <<
  83               GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
  84              GEN6_GS_ENABLE);
  85    ADVANCE_BATCH();
  86 }
  87
  88 static void
  89 upload_gs_state(struct brw_context *brw)
  90 {
  91    /* BRW_NEW_GEOMETRY_PROGRAM */
  92    bool active = brw->geometry_program;
  93    /* BRW_NEW_GS_PROG_DATA */
  94    const struct brw_vue_prog_data *prog_data = &brw->gs.prog_data->base;
  95    const struct brw_stage_state *stage_state = &brw->gs.base;
  96
  97    if (!active || stage_state->push_const_size == 0) {
  98       /* Disable the push constant buffers. */
  99       BEGIN_BATCH(5);
 100       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
 101       OUT_BATCH(0);
 102       OUT_BATCH(0);
 103       OUT_BATCH(0);
 104       OUT_BATCH(0);
 105       ADVANCE_BATCH();
 106    } else {
 107       BEGIN_BATCH(5);
 108       OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 |
 109                 GEN6_CONSTANT_BUFFER_0_ENABLE |
 110                 (5 - 2));
 111       /* Pointer to the GS constant buffer.  Covered by the set of
 112        * state flags from gen6_upload_vs_constants
 113        */
 114       OUT_BATCH(stage_state->push_const_offset +
 115                 stage_state->push_const_size - 1);
 116       OUT_BATCH(0);
 117       OUT_BATCH(0);
 118       OUT_BATCH(0);
 119       ADVANCE_BATCH();
 120    }
 121
 122    if (active) {
 123       BEGIN_BATCH(7);
 124       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
 125       OUT_BATCH(stage_state->prog_offset);
 126
 127       /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled as it
 128        * was previously done for gen6.
 129        *
 130        * TODO: test with both disabled to see if the HW is behaving
 131        * as expected, like in gen7.
 132        */
 133       OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE |
 134                 ((ALIGN(stage_state->sampler_count, 4)/4) <<
 135                  GEN6_GS_SAMPLER_COUNT_SHIFT) |
 136                 ((prog_data->base.binding_table.size_bytes / 4) <<
 137                  GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
 138
 139       if (prog_data->base.total_scratch) {
 140          OUT_RELOC(stage_state->scratch_bo,
 141                    I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
 142                    ffs(prog_data->base.total_scratch) - 11);
 143       } else {
 144          OUT_BATCH(0); /* no scratch space */
 145       }
 146
 147       OUT_BATCH((prog_data->urb_read_length <<
 148                  GEN6_GS_URB_READ_LENGTH_SHIFT) |
 149                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT) |
 150                 (prog_data->base.dispatch_grf_start_reg <<
 151                  GEN6_GS_DISPATCH_START_GRF_SHIFT));
 152
 153       OUT_BATCH(((brw->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
 154                 GEN6_GS_STATISTICS_ENABLE |
 155                 GEN6_GS_SO_STATISTICS_ENABLE |
 156                 GEN6_GS_RENDERING_ENABLE);
 157
 158       if (brw->gs.prog_data->gen6_xfb_enabled) {
 159          /* GEN6_GS_REORDER is equivalent to GEN7_GS_REORDER_TRAILING
 160           * in gen7. SNB and IVB specs are the same regarding the reordering of
 161           * TRISTRIP/TRISTRIP_REV vertices and triangle orientation, so we do
 162           * the same thing in both generations. For more details, see the
 163           * comment in gen7_gs_state.c
 164           */
 165          OUT_BATCH(GEN6_GS_REORDER |
 166                    GEN6_GS_SVBI_PAYLOAD_ENABLE |
 167                    GEN6_GS_ENABLE);
 168       } else {
 169          OUT_BATCH(GEN6_GS_REORDER | GEN6_GS_ENABLE);
 170       }
 171       ADVANCE_BATCH();
 172    } else if (brw->ff_gs.prog_active) {
 173       /* In gen6, transform feedback for the VS stage is done with an ad-hoc GS
 174        * program. This function provides the needed 3DSTATE_GS for this.
 175        */
 176       upload_gs_state_for_tf(brw);
 177    } else {
 178       /* No GS function required */
 179       BEGIN_BATCH(7);
 180       OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
 181       OUT_BATCH(0); /* prog_bo */
 182       OUT_BATCH((0 << GEN6_GS_SAMPLER_COUNT_SHIFT) |
 183                 (0 << GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
 184       OUT_BATCH(0); /* scratch space base offset */
 185       OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
 186                 (0 << GEN6_GS_URB_READ_LENGTH_SHIFT) |
 187                 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT));
 188       OUT_BATCH((0 << GEN6_GS_MAX_THREADS_SHIFT) |
 189                 GEN6_GS_STATISTICS_ENABLE |
 190                 GEN6_GS_RENDERING_ENABLE);
 191                 OUT_BATCH(0);
 192       ADVANCE_BATCH();
 193    }
 194    brw->gs.enabled = active;
 195 }
 196
 197 const struct brw_tracked_state gen6_gs_state = {
 198    .dirty = {
 199       .mesa  = _NEW_PROGRAM_CONSTANTS |
 200                _NEW_TRANSFORM,
 201       .brw   = BRW_NEW_BATCH |
 202                BRW_NEW_CONTEXT |
 203                BRW_NEW_FF_GS_PROG_DATA |
 204                BRW_NEW_GEOMETRY_PROGRAM |
 205                BRW_NEW_GS_PROG_DATA |
 206                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
 207    },
 208    .emit = upload_gs_state,
 209 };